JP2511901B2 - Automatic two-sided document feeder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic double-sided document feeder which is capable of reversing a document used in a copying machine or the like.

2. Description of the Related Art In recent years, the demand for copying machines has increased, and in addition to single-sided originals, automatic double-sided copying machines and automatic double-sided document feeders (hereinafter referred to as IADFs) have become popular. Hereinafter, the conventional IADF described above with reference to the drawings
A copying machine equipped with will be described.

FIG. 3 shows a conventional IADF double-sided document conveying path. In FIG. 3, 1 is a document tray, 2 is a paper feed section,
Reference numeral 3 is a transport unit, 4 is a reversing unit, 5 is a discharge tray, and 6 is a document platen of a copying machine (not shown). The operation of the conventional IADF double-sided document conveying path configured as described above will be described below.

First, a double-sided original (the first page is facing downward and is at the bottom at the bottom) stacked on the document tray 1 with the small-sided document surface facing downward is separated by the paper feeding unit 2 from the uppermost one, and is conveyed by the conveying unit. It is transported up to 3. (Conveyance Path 7a) Next, the double-sided document conveyed to the conveyance unit 3 passes on the document platen 6 and is conveyed to the reversing unit 4. (Transport path 7b)
Next, the sheet passes through the reversing section 4, is conveyed again to the conveying section 3 (conveying path 7c), and is set at a predetermined position on the original platen 6. The operation of reversing the document on the document tray 1 by the reversing unit 4 and setting it at a predetermined position on the document platen 6 (conveyance paths 7a → 7b → 7c) is called a double-sided sheet feeding operation. Due to the double-sided paper feeding operation, the original surface having a large page is set on the original platen 6, and the copying machine performs the exposure by the desired number of copy sheets set by the operator to perform copying. When the desired number of copies have been exposed, the double-sided original on the original platen 6 is conveyed again to the conveying section 3 via the reversing section 4 and set at a predetermined position on the original platen 6. The operation of reversing the original on the original platen 6 by the reversing unit 4 and setting it at a predetermined position on the original platen 6 (conveyance paths 7b → 7c) is called an inversion operation. By the reversing operation, the original surface having a small page is set on the original platen 6 and the copying apparatus similarly performs the desired number of copies. As described above, when the desired number of copies of the surface of the original having a small number of pages have been exposed, the double-sided original on the original platen 6 passes through the reversing unit 4 and is delivered to the discharge tray 5. (Transport path 7b → 7d). At this time, the document surface having a small page is stored upward. Further, the operation at this time is called a discharging operation.

In the same manner, the next double-sided document feeding operation is performed in parallel with the discharging operation, and then the reversing operation is performed to replace the double-sided originals stacked on the original tray 1. On the other hand, the copying machine performs a copy process operation such as development, transfer, separation, and fixing after exposing the surface of the original set on the original platen 6 at a predetermined position to create a copy.

SUMMARY OF THE INVENTION However, with the above-described configuration, a copy sheet is jammed during the copy process operation, or another copy is interrupted by another operator during the copy operation, so that the original document is interrupted. Since the original document on the platen 6 remains, the operator must open the IADF and return the original document to the original tray 1. Also, the original must be returned to the original tray 1 with the small-sided original face down. If the original has the number of pages, check the front and back of the original, and if the original does not have the number of pages, It was necessary to judge based on the contents of the manuscript, or to judge and return after checking the copied paper. Therefore, there has been a problem that copying the double-sided original is troublesome and easy to make mistakes.

In view of the above-mentioned problems, the present invention provides an IADF that allows a copy operation to be performed easily, accurately and in a short time when a copy is made from a double-sided original.

Means for Solving the Problems In order to solve the above problems, the IADF of the present invention includes an original tray on which originals are stacked in page order, a paper feed unit for supplying originals from the original tray onto an original platen, and an original. The document tray includes a reversing unit for reversing the front and back of a document supplied on the platen, a discharge unit for discharging and storing the document on the document platen, and a document storage unit for determining the front and back of the document surface on the document platen. In the paper feed section, only one sheet of double-sided originals with the small document side facing down is separated and fed from the uppermost section, passes through the conveyance section and the original platen, and is turned upside down by the reversing section and is conveyed again. Double-sided sheet feeding operation of feeding the sheet to the original platen and setting it on the original platen, reversing operation of inverting the original on the original platen when a predetermined number of exposures are completed, and information of the original storage section when a copy paper jam occurs. Due to Or to discharge operation for discharging serial the document on the document platen after the execution of the reverse operation to the discharge unit, or in which and a conveyance control means for performing the discharge operation without performing the reversing operation.

With the above-described structure, the present invention always ejects the originals on the original platen to the ejecting section so that they are always in the page order at the time of copying interruption such as jamming of copy paper or interruption copying. Thus, the copying operation of a double-sided original can be performed easily and surely.

Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a control block diagram of the IADF in the present invention. FIG. 2 is an operation flowchart when a copy paper jam occurs during copying of a double-sided original. In FIG. 1, a communication control unit 8 is connected to a control unit (not shown) of the copying machine by a communication means 9 so that the IADF can be controlled in cooperation with the copying machine. Reference numeral 10 denotes a conveyance control unit, which separates and feeds a double-sided original stacked on the original tray 1 with the small-sided original surface facing downward in the paper supply unit 2 from the top.
A double-sided sheet feeding operation in which the front and back sides are inverted by the reversing unit 4 via the transport unit 3 and the document platen 6 and is transported again to the transport unit 3 and set on the document platen 6, and the document on the document platen 6 is transported by the transport unit 3. Inversion section 4 reverses the sheet and conveys it again to the conveyance section 3 and sets it on the original platen 6, and an ejection operation for ejecting the original on the original platen 6 by the conveyance section 3 to the ejection tray 5 through the inversion section 4. Sequence control. Reference numeral 11 is a document storage unit that determines whether the front side or the back side of a double-sided document fed from a document tray is set on the document platen. The operation when a copy sheet jam occurs during copying of a double-sided original will be described with reference to FIGS. 1 and 2.

The operator always stacks double-sided originals on the original tray with the original side of the small page facing downward. In other words, the one-page originals are stacked at the bottom and face down. If a double-sided original is copied in this state, the double-sided paper feeding operation is first performed. Immediately after the start of this double-sided paper feeding operation, when the original is conveyed from the original tray to the conveying section, the contents of the original storing section 11 are reset to "0". Then, the contents of the document storage unit 11 are reversed when the document is conveyed to the conveyance unit through the reversing unit and set on the document platen. That is, when the double-sided sheet feeding operation is completed, the content of the document storage section 11 is the set state “1”. When the reversing operation is performed next, the contents of the document storage unit 11 are reversed, and the reset state becomes "0". After that, when the discharging operation is performed, the double-sided original on the original platen is discharged upward with the original surface having a small page. That is, when the content of the document storage unit 11 is in the set state "1", the document surface with a large page is on the document platen, and conversely, when the content is in the reset state "0", the document surface with a small page is on the platen.

By discriminating the contents of the document storage unit 11 in this manner, the document surface on the document platen can be known.

The operation when a copy sheet jam occurs during copying of the IADF double-sided original configured as described above will be described with reference to FIG. When the copy sheet is jammed during copying using the IADF, it is determined based on the content of the document storage unit 11 whether the document surface on the document platen is the larger or smaller page (step 12). Immediately ejects (step 13). On the other hand, in the case of a document surface having a large page, the document reversing operation is performed to reverse the document surface (step 14), and then the discharging operation is performed (step 13). In this way, when a copy sheet jam occurs during copying of a double-sided original, the small-sided original surface can always be discharged upward regardless of the size of the page of the original surface of the double-sided original on the original platen.

As described above, according to the present embodiment, the originals are stacked on the original tray with the small-sized original surface facing downward, and the originals supplied from the top to the original platen are jammed by the copy paper of the copying apparatus. When copying is interrupted, by ejecting the document with the small page facing up, you can always flip the document ejected when copying resumes, set it on the document tray, and then start copying. Since it is not necessary to open the document platen to take out the document, the copying operation can be performed easily and surely.

In this embodiment, the original side of the small page is set face down on the original tray, the double-sided paper feeding operation is performed from the top to copy the original side of the large page, and then the reverse operation is performed to copy the original side of the small page. Then, the original was ejected and the original with the smaller page was ejected and stored upward.However, the original with the smaller page was set up on the original tray and the normal paper feeding operation was performed from the bottom to copy the original with the larger page. Then, the reversing operation may be performed next to copy the document surface having a small page, the document may be discharged, and the document surface having a small page may be discharged and stored upward.

As described above, according to the present invention, a document tray on which documents are stacked in page order, a paper feed unit for feeding documents from the document tray onto the document platen, and a reversal for inverting the documents supplied on the document platen Section, a discharge section for discharging and storing a document on the document platen, and a document storage section for determining the front and back of the document surface on the document platen, and are stacked on the document tray with the document surface with the small page facing downward. In the paper feed section, only one sheet from the top is separated and fed, the document is fed through the transport section and the document platen, the reversing section reverses the front and back, and is transported to the transport section again and set on the document platen. When the paper operation and the exposure of a predetermined number of sheets are completed, the reversing operation of reversing the original on the original platen, and when the copy paper is jammed, the original of the original on the original platen is recorded by the information of the original storage unit after the execution of the reversing operation. When a copy paper jam occurs, a double-sided original on the original platen is output when a copy paper jam occurs by performing a discharge operation of discharging the draft to the discharge unit or by performing the discharge operation without executing the reversing operation. When the copy paper is jammed, the operator can always eject the ejected originals in the eject section by the same procedure, that is, always return them to the original tray. Work can be performed easily and reliably. Further, it has an advantage that the manufacturing cost is extremely low with a simple modification.

[Brief description of drawings]

FIG. 1 is a control block diagram of an automatic double-sided document feeder according to an embodiment of the present invention, FIG. 2 is an operation flowchart when a copy sheet jam occurs during copying of a double-sided document, and FIG. It is a double-sided document conveyance path figure of a double-sided document feeder. 1 ... manuscript tray, 2 ... paper feed section, 3 ... transport section, 4 ...
… Reversing part, 5… Ejection tray, 6… Original platen, 7
a, 7b, 7c, 7d ... transport path, 8 ... communication control section, 9 ... communication means, 10 ... transport control section, 11 ... document storage section.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G03G 15/00 526 G03G 15/00 526 21/00 500 21/00 500

Claims (2)

(57) [Claims] 1. A manuscript tray on which manuscripts are stacked in page order, a paper feed unit for supplying manuscripts from the manuscript tray onto a manuscript platen, an inversion unit for inverting the manuscript supplied on the manuscript platen, and the manuscript. Equipped with a discharge unit that discharges and stores the originals on the platen, and an original storage unit that determines the front and back sides of the originals on the original platen, and only one double-sided original stacked on the original tray from the top Separately feed the paper, pass through the document platen in the transport section, reverse the front and back in the reversing section, transport it to the transport section again, and set it on the document platen. When the document on the platen is reversed and the copy sheet is jammed, the document storage unit performs the discharging operation to discharge the document on the document platen to the discharging unit after the reverse operation is performed, or Serial inversion operation to have a transfer control means for performing the discharge operation without executing feed automatic duplex document feeder, characterized in device. 2. A manuscript tray on which a manuscript having a small manuscript surface facing downward is stacked, and a conveyance control means for discharging the manuscript with a manuscript surface facing downward when a copy paper jam occurs. The automatic double-sided document feeder according to claim 1.